Improvement in emery grinding-machines



E. w. GUNN, a. n'. & H. WELLS.

Emery-Grinding Machine. 7 N 0 6 1 9 5 1 I Pate n ted A pri'l 13, I875.

I VENTOR: 6 I

ATTBBNEYS.

HE GRAPHIC C0.PHOTO.-LITH.39B=41 PARK PLAGLILY.

UNITED STATES PATENT QFFIGE.

E. WILLIAM GUNN, OF NEW WVOODSTOOK, AND GEORGE I). WELLS AND HARRISONWELLS, OF ERIEVILLE, NEW YORK.

IMPROVEMENT IN EMERY GRINDING-MACHINES.

Specification forming part of Letters Patent No. 161,951, dated'April13, 1875; application filed January 25,1875.

To all whom it may concern:

Be it known that we, E. WILLIAM GUNN, of New Woodstock, in the county ofMadison and State of New York, and GEORGE D. WELLs and HARRISON WELLS,of Erieville, in the county of Madison and State of New York, haveinvented a new and useful Improvement in Universal-Joint Emery-WVheelMachine, of which the following is a specification Figure 1 is a sideview of our improved machine. Fig. 2 is a detail section of the same,taken through the line 00 00, Fig. 1. Fig. 3 represents the adjustablelocking-joint for the handle-yoke. Fig. 4 represents one of the lugswit-h which the ends of the handle-yoke are connected.

Similar letters of reference indicate corresponding parts.

Our invention has for its object to furnish an improved emery wheelmachine, which shall be so constructed that the emery-wheel may beturned into any position that the form of the work being ground mayrequire without stopping the wheel or checking its speed, and whichshall be simple in construction and convenient in use, being soconstructed as to expand and contract as the band is twisted andstraightened in using the machine, and which will enable the bands to bereadily slackened and tightened as may be required.

The invention consists in the joint or connection formed by thecombination with the yokes or frame-pieces of one or two rods, havingright and left screw threads out upon their opposite ends 5 in thecombination of the adjustable collars and the toes or projections andnotches with the screw-rods, either or both, and the pivoted yokes, inthe combination of the adjustable yoke-handle, provided with pivots anda stop-pin, the nut-handle, and the lugs, provided with pivot andstoppin holes, with the yoke that carries the emery-wheel, all ashereinafter described.

A is a yoke, designed to be attached to the ceiling or other suitablesupport, and to the arms of which is attached a short shaft, 13, uponwhich are placed two pulleys, O D, to receive the driving-belt E, and alarge pulley, F, to receive the band G. The pulley 0 runs loosely uponthe shaft B, and the pulley D is rigidly connected with the pulley F, soas to carry the said pulley F with it in its revolu tion. Upon the shaftB is hung the arms of a yoke, H, in the base of which is formed ascrew-hole to receive the screw-thread formed upon the end of the red I.The other end of the rod I has a screw-thread out upon it, which screwsinto a screw-hole formed in the base of the yoke J. The rod I has aright screwthread out upon one end, and a left screwthread upon theother end, so that by turning the rod I in one direction the yokes H Jmay be drawn toward each other to slacken the band G, and by turningsaid rod in the other direct-ion the said yokes H J may be forced apartto tighten the said band Gr. To the arms of the yoke J is attached ashort shaft, K, upon which are placed two pulleys L M, of unequal size,and which are formed in one piece, or are rigidly connected together.The smaller pulley L receives the band G, and the larger pulley Mreceives the band N. To the shaft K are also pivoted the middle parts ofthe side bars or arms of the double yoke 0, inthe forward base or bendof which is formed a screw-hole to receive the screw thread formed uponthe end of the rod P. Upon the other end of the rod P is cut ascrew-thread to screw into a screw-hole in the base or bend of the yokeQ. Right and left screw-threads are formed upon the ends of the rod P,so that by turning the said rod in one or the other direction the yokesO and Q may be moved toward or from each other, to slacken or tightenthe band N. In bearings in the ends of the yoke Q revolves a shaft, R,to which is attached a pulley, S, to receive the band N, and also theemery-wheel T, by which the grinding is done. The emery-wheel '1 may beattached to the shaft R within the arms of the yoke Q, as shown in Fig.1, or the said shaft may be extended, and an emery-wheel attached toeither or both ends. In fact, any desired number of emery-wheels may beattached to the shaft R,

or a single wheel may be used, attached to any desired part of the saidshaft R, as may be most convenient, considering the character of thework to be done. Upon the ends of the arms of the yoke Q are formed lugsU, having holes formed in them to receive pivots formed upon or attachedto the ends of the yoke V, upon the base of which is formed, or to it isattached, a handle, W. One of the pivots of the handle-yoke W V projectsinward, and the other outward, for convenience in inserting them in thepivot-holes of thelugs U. The outwardly-projecting pivot is made long,and has a screwthread upon it to fit into the screw-hole formed in thehandle X, which thus serves the double purpose of a nut to fasten thehandle-yoke in place, and of a handle for controlling the machine.Another handle may be attached to the other arm of the handle-yoke, ifdesire d. To the end of the handle-yoke V is attached, or upon it isformed, a point or pin, v, to enter one or the other of a circle ofholes formed in the adjacent face of the lug U, to prevent the saidhandle-yoke from turning upon its pivots, and to enable said handle-yoketo be adjusted at any desired angle. Upon the rods 1 and P, either orboth, are placed collars, which are secured in place by set-screws 12and are provided with toes and notches 11/ to impinge upon and interlockwith a toe, formed upon the yokes.

By this construction, by adjusting the collars Y the movements of therods and yokes upon each other may be limited or entirely prevented, asmay be desired.

Into a screw-hole in the rear base or bend of the double yoke O issecured a rod, Z, upon which is placed a collar, A, into one side ofwhich is secured the shank of a hook, B, to receive a weight, 0, forbalancing the forward part of the machine, with which the emerywheel isconnected, and enable said wheel to be easily guided and controlled.Upon the iorward side of the arms of the yoke A are formed arms D, inthe ends of which are formed holes to receive the bar E of thebelt-shifter. One or both the holes of the arms D, and one or both theends ofthe bar E, are made square, to prevent the said bar E fromturning. To the bar E are attached two pins, 0, to take hold of thedriving-belt, and shift it from one to the other of the pulleys O D. Tothe side of the bar E is attached a pin, a, to enter a short slot in thelever F. In the upper part of the lever F is formed a short slot, toreceive a pin or screw, G, attached to the yoke A, to serve as a pivotfor the said lever F. To the upper end of the lever F is attached, orupon it is formed, a pin, 1), to enter one or the other ofthe notches inthe flange a formed upon the yoke A. to lock the belt E upon either ofthe pulleys G D.

By this construction, by pushing the lever F upward to raise the pin bout of the notch of the flange a, the said lever F may be operated toslide the bar E, and shift the belt. When the lever F is released itsown weight draws it down, bringing the pin b into the notch of theflange a, locking the said lever in position, and thus keeping thedrivingbelt upon the pulley upon which it has been placed.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. The combination, with the yokes specified,of one or more connecting-rods, having a righthand screw-thread on oneend, and a left-hand screw-thread on the other, as shown and described.

2. The combination of the adjustable collars Y, and the toes orprojections and notches g 3 with the screw-rods I P, either or both, andthe pivoted yokes, substantially as herein shown and described.

3. The combination of the adjustable yokehandle V WV, provided withpivots and a stoppin, the nut-handle X, and the lugs U, provided withpivot and stop-pin holes, with the yoke Q, that carries the emery-wheel,substantiall y as herein shown and described.

E. WILLlAM GUNN. GEORGE D. WVELLS. HARRISON WELLS. Witnesses JAMESSTEVENSON, LUOIAN B. PER INS.

